Configuration to reach OWA with exchange.mydomain.com

I have a SBS 2003 with OWA reachable through https://server.domain.com/exchange and I would like to make it possible to reach it through exchange.domain.com. Can you please tell me the exact steps to do so, both in terms of DNS (not SBS') and IIS (and whatever else is needed)?

1. Create an external DNS record of exchange.domain.com with the same IP address of server.domain.com
2. Create a new website within IIS (call is Exchange Redirect for example), within properties, select Advanced on the Web Site tab and assign the host header value of exchange.domain.com.
3. Create a redirect page at the root of the Exchange Redirect site create a redirect page (code below) called index.htm

When users hit exchange.domain.com they will be redirected to server.domain.com/exchange

are you getting access denied on server.domain.com/exchange or exchange.domain.com?

What folder are you pointing the exchange.domain.com wesbite at? ACL permissions is suggesting that the permissions on the folder on the hard disk doesn't allow IUSR_SERVERNAME.
I would guess that exchange.domain.com is pointing at c:\intepub\wwwroot\exchangeredirect (or something similar). Check the permissions on this folder and files and make sure that IUSR_SERVERNAME has got read access.

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